40 g of calcium was extracted from 56 g of calcium oxide
(Atomic mass of Ca= 40, O=16)
i) What mass of oxygen is there in 56 g of calcium oxide?
ii) How many moles of oxygen atoms are there in this ?
iii) How many moles of calcium atoms are there in 40 g of calcium?
iv) What mass of calcium will be obtained from 1000 g of calcium oxide?
Answers
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Atomic mass of calcium = 40g
Atomic mass of oxygen = 16g
(i) mass of calcium oxide = 56g Mass of calcium = mass of CaO -
mass of oxygen
56-16 =40g
(ii) mass of oxygen present in
CaO=16g
No. of moles= given mass/atomic
mass
= 16/16 = 1 mole of oxygen
(iii) mass of Ca present in CaO= 40g
No. of moles = 40/40 = 1 mole of Ca
(iv) from 1g of CaO, 40/56 g of Ca can be obtained
Therefore, from 1000g of CaO,
(40/56)×1000 g of Ca can be obtained
Therefore, approximately 714.28g of Ca can be obtained.
Hope it helps
Atomic mass of oxygen = 16g
(i) mass of calcium oxide = 56g Mass of calcium = mass of CaO -
mass of oxygen
56-16 =40g
(ii) mass of oxygen present in
CaO=16g
No. of moles= given mass/atomic
mass
= 16/16 = 1 mole of oxygen
(iii) mass of Ca present in CaO= 40g
No. of moles = 40/40 = 1 mole of Ca
(iv) from 1g of CaO, 40/56 g of Ca can be obtained
Therefore, from 1000g of CaO,
(40/56)×1000 g of Ca can be obtained
Therefore, approximately 714.28g of Ca can be obtained.
Hope it helps
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